In building a 6-BR with a 1 and 8 twist. Why do some shooters have a compensator on the end of the barrel. What advanage is it the shooter. Also with a panda action should the barrel be straight or a Remington contour. What are the requirment for the F class. I have a Remington that has been blue printed with a 1 and 12 twist that shoots out standing. The most accurate rifle that anyone could ask for. Just wondering, I may have two in the future. Thanks for the information